S3 provider does not honor PROPERTY_STRIP_EXPECT_HEADER

I set the strip-expect-header property to TRUE always. However, jclouds wire logs suggest that it does not get honored when the provider is S3.

Wire logs when provider is S3: http://pastie.org/private/kwyt6adpebuflop9ovouw
Wire logs when provider is CloudFiles-UK: http://pastie.org/private/nsrvyuxqhyktdmdhop7aag